Free Online Treemap Maker
Visualize hierarchical data as nested rectangles. Great for showing proportions at scale.
Create Your Treemap Now — It's FreeWhat Is a Treemap?
Treemaps excel at revealing which items dominate a dataset at a glance. They comfortably handle dozens or even hundreds of categories that would overwhelm a pie chart. Key visual components include proportionally sized rectangles, text labels inside each tile, a color legend mapping categories, and optional borders separating hierarchy levels. Hover tooltips display exact values and percentages for precise reading.
What Data You Need for a Treemap
A treemap needs one row per leaf node: a single label column that encodes the hierarchy with "Parent > Child" path syntax (you can use >, /, or | as the separator) plus one positive numeric value column for the rectangle's area. Internal/parent nodes are not entered directly — they are created and summed automatically from their children. Example rows: "Cloud > AWS" 48200, "Cloud > GCP" 19100, "Salaries > Engineering" 91000 — AWS's box tiles ~2.5x the area of GCP's, and the "Cloud" parent box equals their sum.
When to Use a Treemap
Treemaps are widely used in IT management, financial analysis, and business intelligence dashboards. Choose a treemap over a pie chart when you have more than six categories or need to show nesting. Choose it over a bar chart when screen space is limited and you want a compact, area-based overview. If the hierarchy depth itself is the story, consider a sunburst chart instead. Treemaps work best when the audience needs to compare relative sizes quickly without reading exact numbers.
Where a Treemap Works Best
- Auditing cloud or SaaS spend where costs nest as provider > service > region and you need the biggest line items to pop by size, not sort order.
- Visualizing disk or storage usage (folders within drives within volumes) so the one bloated directory eating 60% of a partition is impossible to miss.
- Showing portfolio or index composition — sectors containing holdings sized by market weight, a layout familiar from stock-market 'market map' heatmaps.
- Breaking down survey or revenue data with a genuine part-of-whole hierarchy, like product line > SKU > units sold, in a single compact panel instead of a long stacked bar.
Treemap Example: AWS bill breakdown
A platform team gets a surprise $112k monthly AWS invoice and wants to see where the money actually goes before the budget review. They export the cost-explorer CSV grouped by service and feed it straight in as parent/leaf/value rows.
Sample data: Compute>EC2: 41200; Compute>Lambda: 6800; Storage>S3: 23400; Storage>EBS: 9100; Data>RDS: 18700; Data>Redshift: 7600; Network>CloudFront: 3300; Network>NAT: 2100
EC2 and S3 alone tile over half the canvas, and the tiny NAT/CloudFront slivers reveal that 'networking is expensive' was a myth — the real lever is right-sizing EC2.
How to Create a Treemap Online
- Step 1: Open ChartLoad and select the Treemap chart type from the chart picker on the main page
- Step 2: Enter your category labels in the first column and corresponding numeric values in the second column
- Step 3: For hierarchical data, define parent-child relationships to create nested rectangle groupings in your dataset
- Step 4: The rectangles automatically size themselves proportionally based on each value relative to the total
- Step 5: Customize the color palette, label fonts, border styles, and title to enhance readability and appeal
- Step 6: Click Export and download your treemap as PNG, PDF, SVG, JPEG, or WebP
Treemap Best Practices & Tips
- Use treemaps when you have too many categories for a pie chart — treemaps handle dozens to hundreds.
- Color-code by hierarchy level or a second variable to add an extra dimension of information.
- Add nesting borders between parent and child levels so the hierarchy structure is visually clear.
- Label only the largest tiles directly; use tooltips for smaller ones to prevent text overlap.
- Compare treemaps across time periods side by side to spot which categories are growing or shrinking.
- Treemaps handle hundreds of categories gracefully — they are the go-to chart for large hierarchical datasets.
- Use hover tooltips to show exact values and percentages since judging rectangle areas by eye is imprecise.
- Interactive treemaps let users click any tile to zoom into its children — take advantage of this drill-down capability for hierarchical data exploration in dashboards and analysis tools.
Common Treemap Mistakes to Avoid
- Feeding negative numbers or percentages that sum past 100 — rectangle area must come from a positive absolute magnitude, so a -$5k refund or a 'share %' column breaks the tiling and silently drops nodes.
- Cramming 300 leaf nodes onto one canvas: rectangles shrink below ~3px and labels vanish, so cap visible depth or roll the long tail into an 'Other' box before mapping.
- Using a treemap to compare two nearly-equal values — humans read area far worse than length, so 48k vs 51k looks identical here when a bar chart would show the gap instantly.
- Coloring rectangles randomly instead of by category or a second metric — color is a free encoding channel, and wasting it on decoration throws away the treemap's main advantage over a plain table.
Frequently Asked Questions
Can I show multiple hierarchy levels?
Yes, add parent-child relationships in your data for nested rectangles.
When should I use treemap vs pie chart?
Use treemaps for many categories (10+) or hierarchical data. Use pie charts for simple 2-6 category breakdowns.
Can I add borders between hierarchy levels?
Yes. Enable nesting borders to visually separate parent categories from their children. This makes the hierarchy clearer without needing a legend for every group.
Related Chart Types
Ready-Made Treemap Templates
Skip the blank canvas — open a free, editable Treemap template, swap in your own data, and export. Browse all templates.
Ready to Create Your Treemap?
No signup. No watermark. 100% free.
Start Creating Now